Layne walked 1200m E to get her lunch. If it took her 25s to go get it

What is her average speed?

What is her average velocity?

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i. e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

Explain the difference in reactivity of the elements based on their electron configurations.